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What To Add To My R/o Water?


GreenDreamz
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I have a Reverse Osmosis system hooked up with 0 ppm coming out. I am going to run the Lucas method dwc totes. Do I add Cal/Mag or somethig to the water? I heard somewhere you can add 10% tap water to your res and it will eliminate the need for cal/mag. My tap water is like 480ppm and 7.8 ph would it even be safe to mix?

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I have a Reverse Osmosis system hooked up with 0 ppm coming out. I am going to run the Lucas method dwc totes. Do I add Cal/Mag or somethig to the water? I heard somewhere you can add 10% tap water to your res and it will eliminate the need for cal/mag. My tap water is like 480ppm and 7.8 ph would it even be safe to mix?

I use r/o and add cal/mag to get my ppm at about 150-200. Most nutes are designed for tap and assume some pre-existing minerals.R/O removes everything the good and the bad , so then you replace with good cal/mag.I'm sure this is but one of many suggestions you may get, but this is my experience.

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I have a Reverse Osmosis system hooked up with 0 ppm coming out. I am going to run the Lucas method dwc totes. Do I add Cal/Mag or somethig to the water? I heard somewhere you can add 10% tap water to your res and it will eliminate the need for cal/mag. My tap water is like 480ppm and 7.8 ph would it even be safe to mix?

 

 

I am also running DWC totes, and using the Lucas formula nutes. This is just my own observation, but I think that it's all in there. I mean all the cal/mag that the plant needs is in the Lucas nutes. I experienced a cal/mag deficiency early on, and picked up some Calmag Plus. After mixing it in and waiting a day or two, I wasn't noticing any improvement. What I did discover was that my pH had gotten way out of spec. I've learned that keeping the pH right is very important. If the nutrient solution is too acidic, or too alkali, then the roots won't take up what the plant needs. I keep my pH at just below 6, and I havent touched that $20 bottle of cal/mag in months. Just sharing what I've learned... I wish you good luck!

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The lucas formula is designed to be used with RO water. You do not need to add anything else, unless you are growing in coco. lucas formula That being said, some strains may require additional nutes to be added if your plants show signs of deficiency. I would not start with any other additives. You probably won't need any.

Edited by wclark
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  • 1 month later...

We've Run DWC for Years..

IMO- If using RO water, using Super Cal-Mag, Micro -blast etc.. and Silica would really help- but watch your EC!

You want to add your nutes 1st-- check the e/c then add the added micros in SMALL amounts-- not full doses-- to reach your ec!!

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  • 4 months later...
  • 1 month later...
  • 1 month later...

I am also running DWC totes, and using the Lucas formula nutes. This is just my own observation, but I think that it's all in there. I mean all the cal/mag that the plant needs is in the Lucas nutes. I experienced a cal/mag deficiency early on, and picked up some Calmag Plus. After mixing it in and waiting a day or two, I wasn't noticing any improvement. What I did discover was that my pH had gotten way out of spec. I've learned that keeping the pH right is very important. If the nutrient solution is too acidic, or too alkali, then the roots won't take up what the plant needs. I keep my pH at just below 6, and I havent touched that $20 bottle of cal/mag in months. Just sharing what I've learned... I wish you good luck!

 

What kinda of ph problems did you have. I am in ProMix and am having some serious downward drift of my ph. Downward to something like 5.4 and in promix is should be right around 6.5. I dont know why it is doing it but can someone please help me out???

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Below is a typical analysis of my tap water. Most of the contents are actualy good for the plants. Some or all of the first 4 items can actualy act as a buffer to stabilize the ph, even if it is adjusted. With R/O water all these chemicals are taken out, and this will contribute to your PH fluctuating the way it is. Letting this tap water sit for 24-48 hours will remove the chloramine which is toxic to plants. There are 2 or 3 other undesireable components which can be partialy removed with a carbon filter. All in all I would prefer to use this water over R/O water when I am growing in soil. Otherwise, it becomes neccesary to add the chemicals back that you have removed with R/O. If you don't, your PH can fluctuate like yours is doing, and also the plants can be deprived of nutrients neccesary for proper growth. I only use R/O water in my bubble buckets, as the results I have gotten using R/O in soil have been less than spectacular. Why spend so much extra time and money adding back minerals that are there in the first place? Try using your tap water instead of R/O and you may find your PH becomes much more stable. Or you can add back the Calcium and Magnesium you have filtered out and this will help too.

 

 

Analyte Reported as mg/l

(except as noted) Typical

Concentration

Range

Calcium CaCO3 50 40-60

Magnesium CaCO3 40 30-40

Total Hardness* CaCO3 90 85-100

Carbonate (CO3) CaCO3 20 15-30

Bicarbonate (HCO3) CaCO3 15 10-25

Total alkalinity CaCO3 35 25-60

Sodium* Na 44 30-60

Iron* Fe 0.2 0.1-0.5

Sulfate* SO4 70 40-150

Chloride* Cl 46 10-100

Silica* SiO2 10 9-14

Fluoride F 1.2 0.6-1.4

Phosphate, Tot P 0.8 0.2-1.0

Phosphate, Ortho P 0.2 0.1-0.5

Chloramine Cl2 (at plant tap) 2.0 1.0-3.5

pH pH units 9.4 9.2-9.8

Turbidity NTU 0.2 NTU 0.1-0.5

Conductivity* uS/cm 350 250-750

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Tap doesn't always work... I live in an old building, my tap water kills plants... I always wondered why my houseplants went downhill so fast, turns out that was it. The pH is around 9, the ppm around 300, and it's probably loaded with copper and other crap, not to mention it's not sterile and probably loaded with crap that could infect the roots...

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um....hmm....tap....no way. lucas was intended to be run with ro....and for anyone else no way. Univ of Wis study showed high phos plants could receive as much as 70 percent of their phos uptake from beneficial fungus in soil... the same kind that tap water kills. ro is the way for lucas, if u grow soil and insist on using tap water, grow in soilless ur killing all the good things in ur soil.

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I use straight tap water. from tap to rez, no warming or waiting. NEVER had a problem.

I root clones in straight (tap) water too.

 

the couple people I know who are on RO have many more problems than me. pH fluctation and a souring of nutes seems common

 

 

I am on the Detroit supply and couldn't be happier

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Definitely depends on your water supply... I did an experiment where I put a few cuttings in cubes soaked in tap water, and a few cuttings in cubes soaked in dilute 1-5-4 nutes in RO water... the pH and ppms being the same. Rooted 2x as fast with the RO water. Ann Arbor tap sucks, at least where I'm at.

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Purklize-

 

had you tried to let your tap water set for a few days and also drop your ph down below 7 each time, before you started w RO water? That ph gets us all sooner or later..

 

previously my plants seemed to like (Lansing) city water and the minor salinity already existing in it. well water/RO has been a real adjustment for me. there is definately a cost associated w added nutes as well.

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IF I have low ph, would it be okay to just ph my feeding water a little bit higher than what I normally would?? Also, I use General Hydroponics ph up and when I put 25 ml Mag Pro and 50 ml Bloom in 5 Gallons of water it takes 120 mls of ph up to get the nutrient solution up to 6.5, I know this isn't right, but has anyone else evr had this problem?? Do you think that maybe i got a bad batch of ph up??

 

Sorry to hijack your post.

Edited by donnachris
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